SceneNode CreateAnnotation(Vector3 start, Vector3 end, Vector3 offset, String text)
{
var line = GeometryBuilder.CreateLine(start + offset, end + offset);
var mesh = FontManager.Instance().CreateMesh(text);
var textNode = new PrimitiveSceneNode(mesh, null);
float scale = 0.015f;
textNode.SetTransform(Matrix4.makeRotationAxis(Vector3.UNIT_X, 3.14159f * 0.5f) * Matrix4.makeScale(scale, scale, 1));
textNode.ComputeBoundingBox(Matrix4.Identity);
float halfW = textNode.GetWorldBBox().getHalfSize().x;
var dist = end.distanceTo(start);
float ratio = (dist * 0.5f - halfW) / dist;
textNode.SetTransform(Matrix4.makeTranslation((start + end) * ratio + offset) * textNode.GetTransform());
var line2 = GeometryBuilder.CreateLine(start, start + offset + new Vector3(0, 0, -2));
var line3 = GeometryBuilder.CreateLine(end, end + offset + new Vector3(0, 0, -2));
GroupSceneNode group = new GroupSceneNode();
group.AddNode(new PrimitiveSceneNode(line, null));
group.AddNode(new PrimitiveSceneNode(line2, null));
group.AddNode(new PrimitiveSceneNode(line3, null));
group.AddNode(textNode);
return(group);
}
public void Create(RenderControl render)
{
// 随便构造些点
float offset = 10.0f;
for (int ii = 0; ii < 10; ++ii)
{
for (int jj = 0; jj < ii; ++jj)
{
mPoints.Add(new Vector3(jj * offset, 100, ii * offset));
}
}
mMotionTrail = new ParticleSceneNode((uint)mPoints.Count, ColorTable.Green, 3.0f);
mCurrentIdx = 0;
render.ShowSceneNode(mMotionTrail);
var lineMaterial = BasicMaterial.Create("myline");
lineMaterial.SetColor(ColorTable.Hex(0xFF0000));
var line = GeometryBuilder.CreateLine(Vector3.Zero, new Vector3(1, 0, 0));
mLineNode = new PrimitiveSceneNode(line, lineMaterial);
mLineNode.SetTransform(MakeTransform(mStart, mPoints[0]));
mLineNode.RequstUpdate();
render.ShowSceneNode(mLineNode);
}